Data Types in Java

In Java, Data types is classified into and categories:

1. Primitive Data Type

2. Non-primitive Data Type

There is 8 primitive data types:

Char boolean byte short int long float double

8 Primitive can classfiied into 4 groups;

Group 1:integer

byte: It is 8 bit integer data type. Value range from-128 to 127. Default value Zero. Examplebyte b=10;

Short : It is a bit integer data type. Value range from-32768 to 32767. Default value Zero. Exampleshort s=11;

int: It is a-bit integer data type. Value range from-2147483648 to 2147483647. Default value Zero. Exampleint i=10;

Long: It is a bit integer data type. Value range from-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. Default value Zero. Examplelong l=100012;

Group 2:floating-point Number

float: It is the + bit float data type. Default value 0.0f. Examplefloat ff=10.3f;

Double: It is a bit float data type. Default value 0.0d. Exampledouble db=11.123;

Group 3:characters

Char: It is a bit unsigned Unicode character. Range 0 to 65,535. Examplechar c=‘a‘;

Group 4:boolean

This group represent boolean , which are a special type for representing True/false values. They is defined constant of the language. Exampleboolean b=true;

2) non-primitive (Reference) Data Type:

A reference data type is used to refer to an object. A reference variable is declare to being of specific and that type can never are change. We'll talk a lot more about reference data type later in Classes and Object lesson.

Data Types in Java